Police: Grand Forks Wal-Mart shooter acted alone, but motive unknown

Police say Marcell Willis did not have any accomplices when he opened fire inside a Grand Forks, North Dakota Wal-Mart, but much of the circumstance surrounding the deadly May 26 shooting remain a mystery.

The investigation into the attack is officially closed, but the reason the 21-year-old U.S. Air Force airman killed one Wal-Mart worker and wounded another before taking his own life is still unknown, the Grand Forks Herald reports

The paper says police could find no connection between Willis – who was stationed at the nearby Grand Forks Air Force Base – and his victims.

The Grand Forks Police Department also released videos collected from the store's security cameras, which you can view by clicking here.

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The airman, originally from Tennessee, was found to have been drunk during the attack – autopsy results showed his blood-alcohol level was twice North Dakota's legal limit at the time.